VC++ expression parsing (computing) tools and source code, written by the Jianghan Petroleum Institute, Department of Computer Science students. Expression only parentheses, functions, operators, constants and variables. A variable name naming rules: 1, can be a character or string , can not begin with a number can not be mixed with spaces, operator or punctuation, as well as the following characters: |, =, & , , $, @,#, `, ~, the function sin, cos, of tan, cot, the sqrt, asin, acos, atan, log, and require lowercase. Function after the variable name in parentheses, can also not in parentheses, such as: log (C1) is the same with logC1. Operator+ (plus),- (minus),* (multiplication),/(division) and ^ (power law).

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